Circuit breaker



Dec. 5, 1933. w. RUSSELL 1,938,467

CIRCUIT BREAKER Filed June 17, 1932 3 William Ruddell Que mm;

Y 4 the shaft by means of a pin 28 through the shaft Patented Dec. 5, l 1933 PATENT Q F FlCE 1,938,467 omoUrr BREAKER William Russell, Hartshorne, om.

Application June 17, 1932. Serial No 617,904

1 Claim.

This invention relates to electro-magnetically operated circuit breakers or switches of the singlepole type and the object of the invention is to provide a circuit breaker which is operated by an electro-magnet when an'overload .or other abnormal conditions, occur on the line and to further provide a devicewhich is simple and durable in construction yet very positive in action, being more sensitive than fuse plugs which are normally used to protect circuits, all as will hereinafter be more fully'described and claimed.

Referring to the accompanying drawing, which is made a part hereof and on which similar reference characters indicate similar parts.

vice in closed position, and

Figure 2, a section on line 22 of Figure 1. In the drawing reference character indicates the base of the switch formed of any suit- ZQ; able insulating material having contact posts 11 and 12 secured by any suitable means thereto. The posts are provided with terminals 13 and 14. A curved blade 15 is pivoted near its center to the post 12, one end of which engages the post 5; 11 when in closed position to complete the circuit between'the posts. The post 11 is provided with a stop 40 which prevents the blade 15 from being depressed too far and yet allows the parts of the post 11 to spring apart. The other end is 5,3 pivotally connected to a rod 16 slidably mounted through the opening 1'7 in-the casing 18 which is secured to the base 10 by any suitable means 19. A disk 20 is secured to the inner end of the rod and a spring 21 is positioned around the rod between the disk and the end of the casing normally holding the other end of the blade 15 out of contact with the post 11 as shown in the dotted line position in Figure 2. A handle 22 is fixed to the blade 15 for use in closing. the switch. The blade 15 is provided with an inwardly projecting hook portion 23 which engages the short end 24 of the arm 25 pivotally mounted at its center on a shaft 26 which is positioned 'at the center of the base 10. The arm is provided with a sleeve 27 around the shaft and isretained on and is'also provided with a narrow plate 39 on the underside to prevent undue wear when being engaged by the hook 23. The arm 25 is formed of a suitable insulating material and is provided with a counter-weight 29 secured on the long end 30 by the bolts 31. The counter-weight is formed of laminated metal suitable to be actedv upon by a magnetic forceand serves as an armature.

. tion.

Figure 1 is a front view in elevation of the de- A magnet 32 is mounted on the base in any suitable manner above the counter-weight and is likewise formed of laminated material. One arm 33 of the magnet 32 is provided with a winding 34 suitably insulated and of suitable characteristics connected at one end 35 to the post 13 and at the other end 36 to the post 37 on the base 10. A stop 38is provided'on the base below the counterweight to prevent the end 24 from rising to such a point where it would not be engaged by the hook 23 to hold the switch in closed posi- Suitable openings 41 are provided for mounting .the switch in position.

depressed and thehook portion 23 rides. over and engages the arm 25 which holds it in closed position. The magnet is of such a construction as to beenergized by the normal load but of a strength insufllcient to attract the armature. Upon the development of any overload or any other abnormal conditions in the'circuit the magnet will be energized to such an extent as to attract the armature and thus break the circuit, the parts resuming the open position as first described. v e I From the above described device it is clearly seen that a circuit in which the device is connected is protected in a positive manner and by a device which is highly sensitive to any abnormal condition which may occur. The device is simple in construction, cheap in manufacture and perfect in operation for the purpose for which it is intended to be used. I

It will be obvious to those skilled in the art that variouschanges may be made in my device withoutdeparting from the spirit of the inven-- tion and therefore I do not limit myself to what is shown in the drawing and described in the specification, but only as indicated by the appended claim. 7

Having thus fully'described my said invention, what I claim as new and desire to secure by Letters Patent, is:

A circuit breaker comprising a base, a contact positioned on said base, a blade .movable in a plane at right. angle to the base pivoted inter of adapted to engage said contact means positioned between the other end of said blade and said base biased to 'hold said blade in open position, an arm parallel to said base and pivoted engage said arm when said blade is pushed inwardly and an eiectro-magnet positioned above said armature adapted to attract said armature upon overload of said circuit thereby releasing said blade to break the circuit, substantially as set forth.

7 WILLIAM RUSSELL.

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